Merge pull request #10 from tseaver/master

Get tests passing on Python 3.2
Merge pull request #11 from tseaver/master

Prune MeldParser to essentials (hide on Python >= 2.7).
Credit Tres Seaver for Python 3 support in the changelog
Add classifiers for Python 3
Remove example.py and melddiff.py
Remove support for ``python meld3.py <file> <mutator>``